How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes ? ( molar mass of calcium
How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes ?
( molar mass of calcium = `40 g mol^(-1)`)
A. 0.5 F
B. 1F
C. 0.25 F
D. 2F
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Correct Answer - A
2 moles of electrons are required to deposit 1 mole of calcium.
Mass of calcium deposited = 10g,
Molar mass of calcium = 40 g `mol^(-1)`
`therefore` No of moles = `10/(40 g "mol"^(-1)) = 0.25` mol
2F are required for 1 mole of calcium
xF are required for 0.25 mole of calcium
`therefore x = 0.25 xx 2 = 0.5 F`
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